CN110487668B - Detection device and detection method for foam cement density along with pressure change - Google Patents
Detection device and detection method for foam cement density along with pressure change Download PDFInfo
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Abstract
The invention provides a device and a method for detecting the density of foam cement along with the pressure change, wherein the device comprises a high-pressure sampling short section and a pressure relief discharge short section, wherein the high-pressure sampling short section comprises a high-pressure sampling pipe, a first throttle valve and a second throttle valve which are connected with the two ends of the high-pressure sampling pipe; the pressure relief discharge nipple comprises a pressure relief discharge pipe connected with the second throttle valve and a pressure relief valve connected to the pressure relief discharge pipe. The method comprises the following steps: after a first throttle valve of a detection device for detecting the density of the foam cement changing along with the pressure is arranged on a bypass valve of a high-pressure pipeline, high-pressure foam cement slurry fluid is guided into a high-pressure sampling cavity; acquiring the pressure in the high-pressure sampling cavity and the quality of high-pressure foam cement slurry fluid in the high-pressure sampling cavity; calculating the density of the high-pressure foam cement slurry fluid under the pressure P by combining the internal volume of the high-pressure sampling cavity; after releasing the pressure in part of the high pressure sampling chamber, the density was recalculated. The invention can obtain the density of the foam cement slurry fluid along with the pressure change.
Description
Technical Field
The invention relates to the technical field of the rule that the density of foam cement changes along with the pressure, in particular to a device and a method for detecting the density of the foam cement changes along with the pressure.
Background
The foam cement slurry is widely applied to the field of petroleum drilling and completion by the unique low density characteristic and the compression characteristic, belongs to the category of gas-liquid two-phase flow, is sensitive to density along with temperature and pressure change, has larger error in calculating the density of the foam cement slurry by utilizing a physical property model due to the fact that a gas phase model is not accurate enough at present, and can adopt proper technological measures better only when the density of the foam cement slurry under different pressures is predicted more accurately in the engineering field to achieve better construction effect.
Both chinese patent publications CN101526445A and CN202676565U can only measure the density under a fixed pressure, but cannot measure the density of the foamed cement slurry and the set cement under different pressures.
The device related to the chinese patent publication CN102539280A has the self-pressurizing and heating functions, and the test is performed by using electric control, so the structure is complex, the operation is complex, and the cost is high.
The device for measuring the density, which is disclosed in the US patent publication US5974858, must be installed on the pipeline to be measured, cannot continuously pressurize, and can only passively measure the density at the temperature and pressure.
It can be seen that no mature device and equipment dedicated to measuring the density of foamed cement slurry is known, and the development of a mature device capable of measuring the density of foamed cement slurry is an urgent task in the field.
Disclosure of Invention
Features and advantages of the invention will be set forth in part in the description which follows, or may be obvious from the description, or may be learned by practice of the invention.
The invention provides a detection device for foam cement density changing with pressure, which comprises a high-pressure sampling short section and a pressure relief discharge short section, wherein the detection device comprises:
the high-pressure sampling short section comprises a high-pressure sampling tube, a first throttling valve and a second throttling valve, wherein the first throttling valve and the second throttling valve are connected to two ends of the high-pressure sampling tube;
the pressure relief discharge short joint comprises a pressure relief discharge pipe connected with the second throttle valve and a pressure relief valve connected to the pressure relief discharge pipe.
In one embodiment of the present invention, the apparatus for detecting the density of foam cement as a function of pressure comprises:
the first pressure measuring instrument is arranged on the high-pressure sampling tube;
and the second pressure measuring instrument is arranged on the pressure relief discharge pipe.
In one embodiment of the invention, the first throttle valve and/or the second throttle valve is a manual throttle valve.
The invention also provides a method for detecting the change of the foam cement density along with the pressure, which is realized by using the device for detecting the change of the foam cement density along with the pressure, and comprises the following steps:
s1, mounting a first throttle valve of the device for detecting the density of the foam cement changing along with the pressure on a bypass valve of a high-pressure pipeline, wherein the first throttle valve, a second throttle valve and a pressure release valve of the device for detecting the density of the foam cement changing along with the pressure are in a closed state;
s2, opening the bypass valve and the first throttle valve, and introducing high-pressure foam cement slurry fluid into a high-pressure sampling cavity surrounded by the high-pressure sampling tube, the first throttle valve and the second throttle valve;
s3, acquiring the pressure in the high-pressure sampling cavity, and marking the pressure as P;
s4, acquiring the quality of the high-pressure foam cement slurry fluid in the high-pressure sampling cavity, and recording the quality as M;
s5, calculating the density rho of the high-pressure foam cement slurry fluid under the pressure P, wherein rho is M/V; wherein V is the internal volume of the high-pressure sampling cavity;
s6, releasing the pressure of part of the high-pressure sampling cavity;
repeating steps S3-S6 until the pressure of the high pressure sampling cavity approaches or equals a preset threshold.
In one embodiment of the present invention, the step S2 includes:
and opening the bypass valve and the first throttle valve to ensure that the high-pressure sampling cavity is completely filled with the high-pressure foam cement slurry fluid and the first throttle valve and the bypass valve are slowly and completely closed after the pressure in the cavity is balanced with the pressure of a high-pressure pipeline.
In one embodiment of the present invention, after closing the first throttle valve and the bypass valve, further comprising:
separating the first throttle valve from the bypass valve.
In one embodiment of the present invention, the step S4 includes:
obtaining the total mass of the high-pressure sampling cavity and the pressure relief discharge cavity, and recording the total mass as m0(ii) a The pressure relief and discharge cavity is formed by enclosing the second throttle valve, the pressure relief and discharge pipe and the pressure relief valve;
obtaining the total mass m of the high-pressure sampling cavity and the pressure relief discharge cavity after the high-pressure foam cement slurry fluid is introduced1；
The mass M of the high-pressure foam cement slurry fluid in the high-pressure sampling cavity is M1-m0。
In one embodiment of the present invention, the step S6 includes:
slowly opening the second throttle valve, and closing the second throttle valve after the pressure in the high-pressure sampling cavity reaches a preset value;
and after the pressure relief valve is slowly opened to release the internal pressure of the pressure relief valve to atmospheric pressure, the pressure relief discharge short section is disassembled to remove the internal fluid, the pressure relief valve is completely closed, and the pressure relief discharge short section is reassembled.
In one embodiment of the present invention, the preset threshold in step S6 is 0 to P.
In an embodiment of the present invention, after the step S6, the method further includes: and drawing a density change curve of the high-pressure foamed cement slurry fluid according to the densities of the high-pressure foamed cement slurry fluid under a plurality of different pressures.
The invention provides a device and a method for detecting the change of foam cement density along with pressure, which have the advantages of simple structure and convenient use, and can obtain the density of foam cement slurry fluid under different gas-liquid ratios and different pressures.
The features and content of these solutions will be better understood by those skilled in the art from reading the present description.
Drawings
The advantages and realisation of the invention will be more apparent from the following detailed description, given by way of example, with reference to the accompanying drawings, which are given for the purpose of illustration only, and which are not to be construed in any way as limiting the invention, and in which:
FIG. 1 is a schematic structural diagram of a device for detecting a change in density of foamed cement with pressure according to an embodiment of the present invention.
Fig. 2 is a schematic view of the apparatus for detecting a change in density of foamed cement according to pressure shown in fig. 1 installed in a high pressure pipeline.
FIG. 3 is a schematic flow chart of a method for detecting the change of foam cement density with pressure according to an embodiment of the present invention.
Detailed Description
As shown in fig. 1, the invention provides a device for detecting foam cement density along with pressure change, which comprises a high-pressure sampling short section 10 and a pressure relief discharge short section 20, wherein:
the high-pressure sampling short section 10 comprises a high-pressure sampling tube 13, a first throttling valve 11 and a second throttling valve 12 which are connected to two ends of the high-pressure sampling tube; the high pressure sampling tube 13 is hollow tubular, and in order to facilitate manual adjustment and control of the fluid in the high pressure sampling tube 13, the first throttle valve 11 and/or the second throttle valve 12 may be manual throttle valves, that is, a handle may be disposed on the first throttle valve 11 and/or the second throttle valve 12, and of course, the implementation of the present invention is not affected by the use of other throttle valves. The high-pressure sampling pipe 13, the first throttling valve 11 and the second throttling valve 12 are assembled together through high-pressure sealing threads. The first throttle valve 11, the second throttle valve 12 and the high-pressure sampling tube 13 enclose a high-pressure sampling cavity.
The pressure relief vent nipple 20 comprises a pressure relief vent pipe 21 connected to the second throttle valve 12 and a pressure relief valve 22 connected to the pressure relief vent pipe. The decompression discharge pipe 21 is hollow and tubular, and one end of the decompression discharge pipe is open. The high-pressure sampling short section is assembled with the high-pressure sampling short section through high-pressure sealing threads, the other end of the high-pressure sampling short section is connected with the pressure release valve 22, and the pressure release valve 22 can be a manual pressure release valve to manually adjust the opening for safe pressure release. The second throttle valve 12, the pressure relief discharge pipe 21 and the pressure relief valve 22 enclose to form a pressure relief discharge cavity.
In addition, a first pressure measuring instrument 14 for measuring the pressure in the high-pressure sampling cavity is connected to the high-pressure sampling nipple 10. The first pressure measuring instrument may be selected from instruments commonly used in the art for measuring pressure, and one option of the present invention is a pressure gauge. The pressure relief vent nipple 20 is connected to a second pressure measuring instrument 23 which measures the pressure in the pressure relief vent cavity. The second pressure measuring device 23 may be selected from the devices commonly used in the art for measuring pressure, and one option of the present invention is a pressure gauge.
In another embodiment of the present invention, a computer is further included, which is connected to the first pressure measuring instrument 14 and the second throttle valve 12, and is configured to control the opening and closing of the second throttle valve 12 according to the received pressure value of the first pressure measuring instrument 14, so as to more accurately obtain the preset pressure value and calculate the density of the high-pressure foamed cement slurry fluid at the pressure.
As shown in fig. 2, when the detection device for detecting the variation of foam cement density with pressure according to the embodiment of the present invention is used, firstly, the inner cavity is ensured to be clean without other residual impurities, the whole device is firmly connected and assembled according to the above structure, then, the device is installed on a high pressure pipeline 30 through which a detected fluid flows, an interface of a bypass valve is arranged on the high pressure pipeline 30, the bypass valve 31 is connected to the interface, so as to facilitate installation and control of the high pressure fluid, and more specifically, when the device is installed, the first throttle valve 11 is connected to the bypass valve 31. In this embodiment, the first throttle 11 and the second throttle 12 are provided with handles, which can be manually adjusted. All inner cavities, valve body structures, connecting screw threads and all materials of the whole device need to meet the requirement of bearing the pressure of the high-pressure pipeline connected with the device, and the relevant design requirements of the pressure container are strictly complied with. The first throttle valve, the second throttle valve and the pressure relief valve on the device are guaranteed to be completely closed before installation, the first pressure measuring instrument and the second pressure measuring instrument work normally and are 0, the bypass valve is completely closed, and then the device can be hermetically connected with the bypass valve through screw threads.
As shown in fig. 3, the present invention further provides a method for detecting a change in density of foam cement with pressure, which can be implemented by using the device for detecting a change in density of foam cement with pressure provided in any embodiment of the present invention, and specifically includes the steps of:
s1, installing a first throttle valve of the device for detecting the change of the density of the foam cement along with the pressure, which is provided by any embodiment of the invention, on a bypass valve of a high-pressure pipeline;
before installation, the first throttle valve, the second throttle valve and the pressure release valve on the detection device for detecting the density of the foam cement changing along with the pressure are ensured to be completely closed, namely in a closed state, the first pressure measuring instrument and the second pressure measuring instrument work normally and are 0, the bypass valve is completely closed, and then the first throttle valve of the device can be hermetically connected with the bypass valve through screw threads.
S2, opening the bypass valve and the first throttle valve, and introducing high-pressure foam cement slurry fluid into a high-pressure sampling cavity surrounded by the high-pressure sampling tube, the first throttle valve and the second throttle valve;
firstly, ensuring that foam cement slurry with a certain pressure and a fixed gas-liquid ratio flows in a high-pressure pipeline, then slowly and completely opening a bypass valve on the high-pressure pipeline, slowly and completely opening a first throttle valve behind the high-pressure pipeline, introducing high-pressure foam cement slurry fluid into a high-pressure sampling cavity, ensuring that the high-pressure sampling cavity is completely filled and the pressure in the cavity is balanced with the pressure of the high-pressure pipeline, slowly and completely closing the first throttle valve and the bypass valve, wherein the pressure measured by a first pressure measuring instrument connected with a high-pressure sampling short section is P1, the pressure measured by a second pressure measuring instrument connected with a pressure relief discharge short section is 0, and finally separating the whole device from the bypass valve, namely separating the first throttle valve from the bypass valve.
S3, acquiring the pressure in the high-pressure sampling cavity, and marking the pressure as P;
the pressure in the high pressure sampling cavity can be directly read by the first pressure measuring instrument.
S4, acquiring the quality of the high-pressure foam cement slurry fluid in the high-pressure sampling cavity, and recording the quality as M;
more specifically, the total mass of the high-pressure sampling cavity and the pressure relief discharge cavity is obtained first and is recorded as m0(ii) a At the moment, no high-pressure foam cement slurry fluid exists in the high-pressure sampling cavity, namely, the total mass m of the high-pressure sampling cavity and the pressure relief discharge cavity0May be acquired before step S1. Then obtaining the total mass m of the high-pressure sampling cavity and the pressure relief discharge cavity after the high-pressure foam cement slurry fluid is introduced1(ii) a Finally, the mass M of the high-pressure foam cement slurry fluid in the high-pressure sampling cavity is M1-m0. The high-pressure sampling cavity is defined by a first throttling valve, a second throttling valve and a high-pressure sampling tube; the pressure relief and discharge cavity is formed by enclosing a second throttle valve, a pressure relief and discharge pipe and a pressure relief valve. The high-pressure sampling cavity and the pressure relief discharge cavity comprise a first throttle valve, a second throttle valve, a high-pressure sampling pipe, a pressure relief discharge pipe and a pressure relief valve.
S5, calculating the density rho of the high-pressure foam cement slurry fluid under the pressure P, wherein rho is M/V; wherein V is the inner volume of the high-pressure sampling cavity;
and S6, releasing the pressure of the high-pressure sampling cavity.
More specifically, the second throttle valve is opened slowly, and the second throttle valve is closed after the pressure in the high-pressure sampling cavity reaches a preset value; wherein, the pressure in the high-pressure sampling cavity can be directly read by a first pressure measuring instrument arranged on the high-pressure sampling tube. And slowly opening the pressure relief valve to release the internal pressure of the pressure relief valve to atmospheric pressure, then detaching the pressure relief discharge short section, namely separating the high-pressure sampling short section from the pressure relief discharge short section, removing the fluid in the high-pressure sampling short section, completely closing the pressure relief valve, and reassembling the pressure relief discharge short section.
And S7, judging whether the pressure of the high-pressure sampling cavity is close to or equal to a preset threshold value, if so, entering the step S8, and if not, returning to the step S3.
In general, the process can be terminated when the pressure in the high pressure sampling chamber approaches or equals a preset threshold, which can be any value taken from 0 to P. In a specific operation, the pressure released in step S6 may be a fixed value or an arbitrary value within a preset range. That is, the pressure is gradually released until the pressure of the high-pressure sampling cavity is close to or equal to the preset threshold value.
And S8, ending the process.
In addition, in another embodiment of the present invention, before step S8, the method may further include: and drawing a density change curve of the high-pressure foam cement slurry fluid according to the densities of the high-pressure foam cement slurry fluid under a plurality of different pressures.
When the device is used specifically, the device for detecting the density of the foam cement changing along with the pressure provided by the embodiment of the invention can be connected to a high-pressure pipeline of 20MPa, and after sampling, the density values of the foam cement paste under 20MPa, 18MPa, 16MPa, 14MPa, 12MPa, 10MPa, 8MPa, 6MPa, 4MPa and 2MPa can be respectively obtained at one time by adopting the method for detecting the density of the foam cement changing along with the pressure provided by the embodiment of the invention through gradual pressure relief and measurement calculation.
In addition, the detection device for the foam cement density changing along with the pressure provided by the embodiment of the invention is connected to a high-pressure pipeline with the pressure of 20MPa, after sampling, two throttle valves and a bypass valve are closed, the detection device for the foam cement density changing along with the pressure is separated from the high-pressure pipeline, a high-pressure sampling short section is independently and integrally detached, water bath curing is carried out at the temperature of 80 ℃, the pressure is suppressed, standing and coagulation is carried out for 72 hours, after the foam cement slurry becomes a set, the throttle valves at two ends are detached, only a high-pressure sampling cavity pipe section is left, the foam set is taken out through coring, the foam set maintenance module under the pressure of 20MPa can be obtained, and deep research on the aspects of later-stage mechanical properties, microstructure and the like can be carried out.
The invention discloses a device and a method for detecting the density change of foam cement along with pressure, which can detect the density change of the foam cement along with the pressure change and provide a reliable and safe research means for the deep research of the foam cement under different gas-liquid ratios and different pressures.
The detection device for the density of the foam cement changing along with the pressure is easy to process, low in cost, capable of conveniently and accurately obtaining the density change rule of the foam cement slurry entering a well under different pressures, and providing reliable basis for construction design parameters. The invention adopts modular design and assembly, the sizes of all parts are flexibly designed and combined, and the pressure reference of the foam cement slurry construction on site can be provided to the maximum extent. The method for detecting the density of the foam cement along with the pressure change is simple, high in reliability and safe to operate.
While the preferred embodiments of the present invention have been illustrated in the accompanying drawings, those skilled in the art will appreciate that various modifications can be made to the present invention without departing from the scope and spirit of the invention. For instance, features illustrated or described as part of one embodiment, can be used with another embodiment to yield a still further embodiment. The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, which is defined in the appended claims.
Claims (8)
1. A detection method of foam cement density along with pressure change is characterized in that the method is realized by using a detection device of foam cement density along with pressure change, the device comprises a high-pressure sampling short section and a pressure relief discharge short section, and the high-pressure sampling short section comprises a high-pressure sampling pipe, a first throttle valve and a second throttle valve which are connected to two ends of the high-pressure sampling pipe; the pressure relief discharge short joint comprises a pressure relief discharge pipe connected with the second throttle valve and a pressure relief valve connected to the pressure relief discharge pipe;
the method comprises the following steps:
s1, mounting a first throttle valve on a bypass valve of a high-pressure pipeline, wherein the first throttle valve, the second throttle valve and the pressure relief valve are in a closed state;
s2, opening the bypass valve and the first throttle valve, and introducing high-pressure foam cement slurry fluid into a high-pressure sampling cavity defined by the high-pressure sampling tube, the first throttle valve and the second throttle valve to balance the pressure in the cavity with the pressure of a high-pressure pipeline;
s3, acquiring the pressure in the high-pressure sampling cavity, and marking the pressure as P;
s4, acquiring the quality of the high-pressure foam cement slurry fluid in the high-pressure sampling cavity, and recording the quality as M;
s5, calculating the density rho of the high-pressure foam cement slurry fluid under the pressure P, wherein rho is M/V; wherein V is the internal volume of the high-pressure sampling cavity;
s6, releasing the pressure of part of the high-pressure sampling cavity;
repeating steps S3-S6 until the pressure of the high pressure sampling cavity is equal to a preset threshold;
the step S4 includes:
obtaining the total mass of the high-pressure sampling cavity and the pressure relief discharge cavity and recording the total mass as m0(ii) a The pressure relief and discharge cavity is formed by enclosing the second throttle valve, the pressure relief and discharge pipe and the pressure relief valve;
obtaining the total mass m of the high-pressure sampling cavity and the pressure relief discharge cavity after the high-pressure foam cement slurry fluid is introduced1；
The mass M of the high-pressure foam cement slurry fluid in the high-pressure sampling cavity is M1-m0。
2. The method for detecting the variation of foam cement density with pressure as claimed in claim 1, wherein the device for detecting the variation of foam cement density with pressure comprises:
the first pressure measuring instrument is arranged on the high-pressure sampling tube;
and the second pressure measuring instrument is arranged on the pressure relief discharge pipe.
3. The method for detecting the change of foam cement density with pressure according to claim 2, wherein the first throttling valve and/or the second throttling valve is a manual throttling valve.
4. The method for detecting the variation of foam cement density with pressure as claimed in claim 3, wherein said step S2 includes:
and opening the bypass valve and the first throttle valve to ensure that the high-pressure sampling cavity is completely filled with the high-pressure foam cement slurry fluid, and slowly and completely closing the first throttle valve and the bypass valve after the pressure in the cavity is balanced with the pressure of a high-pressure pipeline.
5. The method for detecting foam cement density variation with pressure as claimed in claim 4, further comprising, after closing said first throttle valve and said bypass valve:
separating the first throttle valve from the bypass valve.
6. The method for detecting the variation of foam cement density with pressure as claimed in claim 3, wherein said step S6 includes:
slowly opening the second throttle valve, and closing the second throttle valve after the pressure in the high-pressure sampling cavity reaches a preset value;
and after the pressure relief valve is slowly opened to release the internal pressure of the pressure relief valve to atmospheric pressure, the pressure relief discharge short section is disassembled to remove the internal fluid, the pressure relief valve is completely closed, and the pressure relief discharge short section is reassembled.
7. The method for detecting the change of the foam cement density with the pressure as claimed in claim 3, wherein the preset threshold is greater than or equal to 0 and less than P.
8. The method for detecting the variation of foam cement density with pressure as claimed in claim 3, wherein after said step S6, the method further comprises: and drawing a density change curve of the high-pressure foamed cement slurry fluid according to the densities of the high-pressure foamed cement slurry fluid under a plurality of different pressures.
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| CN2018104598775 | 2018-05-15 | ||
| CN201810459877 | 2018-05-15 |
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| CN110487668B true CN110487668B (en) | 2022-03-08 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102435461A (en) * | 2011-11-04 | 2012-05-02 | 中国石油集团川庆钻探工程有限公司长庆固井公司 | Decompression sampling joint |
| CN102539280A (en) * | 2010-12-10 | 2012-07-04 | 中国石油化工股份有限公司 | Temperature increasing and pressurizing foam cement slurry density testing device |
| CN104227846A (en) * | 2013-06-21 | 2014-12-24 | 中国石油化工股份有限公司 | Foam cement paste preparation device and application thereof |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012068006A2 (en) * | 2010-11-15 | 2012-05-24 | Shell Oil Company | System for controlling cement flow in a well |
| CN202141664U (en) * | 2011-06-29 | 2012-02-08 | 中国石油化工股份有限公司 | Quick density measuring device for foam cement slurry |
| US9228122B2 (en) * | 2013-06-05 | 2016-01-05 | Halliburton Energy Services, Inc. | Methods and cement compositions utilizing treated polyolefin fibers |
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2018
- 2018-06-22 CN CN201810647557.2A patent/CN110487668B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102539280A (en) * | 2010-12-10 | 2012-07-04 | 中国石油化工股份有限公司 | Temperature increasing and pressurizing foam cement slurry density testing device |
| CN102435461A (en) * | 2011-11-04 | 2012-05-02 | 中国石油集团川庆钻探工程有限公司长庆固井公司 | Decompression sampling joint |
| CN104227846A (en) * | 2013-06-21 | 2014-12-24 | 中国石油化工股份有限公司 | Foam cement paste preparation device and application thereof |
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